Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: sigfortunata on March 25, 2016, 03:18:39 pm
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Hi
I have fairly new a 3S 11.1v lipo battery with a problem. Two of the cells are OK reaching over 4v when charged , the third cell however will not reach a charge above 3.3v. I am sorting this with the supplier but he does not want this battery back.
Therefore can any members tell me if it is possible to safely disassemble the battery and remove the faulty cell leaving me with a usable 2S 8.4v lipo.
It has a 3S charging connector, would I just be able to remove the faulty cell wires from the connector and charge as a 2S?
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If you are not 110% sure of what you are doing then I would strongly advise to leave well alone.
Not worth the risk for the sake of a few quid
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Would be 7.4v if you dissed one cell.
The Buy It Now initials come to mind %)
Ned
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yeah point taken...just read this thread
Lipo Dangers
http://www.modelboatmayhem.co.uk/forum/index.php/topic,47859.0.html (http://www.modelboatmayhem.co.uk/forum/index.php/topic,47859.0.html)
very enlightening, maybe I will just buy a new one and leave the faulty one alone and use it to test motors circuits etc. :o
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I managed to split a useless 3s into a usable 2s, VERY CAREFULLY, and with brown stained trousers..........but it did work.
I would NOT advise anyone else to do it though.
It only needs a the slightest touch to short the terminals and it WILL explode...not nice....but then I always have been mental.
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I managed to split a useless 3s into a usable 2s, VERY CAREFULLY, and with brown stained trousers..........but it did work.
I would NOT advise anyone else to do it though.
It only needs a the slightest touch to short the terminals and it WILL explode...not nice....but then I always have been mental.
Ah so you too have discovered that adrenaline comes in brown ;D
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Obviously the answer for us mere mortals is
DONT DO IT
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Obviously the answer for us mere mortals is
DONT DO IT
Failing that advice, then at least video events for an entertaining next post. I have a vision of Beaker from the Muppet show O0
Dave
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Hi
I have fairly new a 3S 11.1v lipo battery with a problem. Two of the cells are OK reaching over 4v when charged , the third cell however will not reach a charge above 3.3v. I am sorting this with the supplier but he does not want this battery back.
Therefore can any members tell me if it is possible to safely disassemble the battery and remove the faulty cell leaving me with a usable 2S 8.4v lipo.
It has a 3S charging connector, would I just be able to remove the faulty cell wires from the connector and charge as a 2S?
Yes, it can be done and it can be done safely.
It's not for someone who has little or no experience with wiring and hasent got the ability to work on wiring without having to think about what's what.
but if you understand the circuit and absolutely won't short anything whilst performing the adaptation, there is no physical or safety reason that prevents turning a 3,4 or 6s into a 2s or similar, it's just a circuit but if you do make a mistake you will know instantly and in spectacular fashion
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Seems all 'L' type batteries are not the same??
Having been forced to use Lion batteries, it is what is printed on the Makita battery and now the battery does not charge, looked them up and was surprised that the battery is made up of cells just like a NiMh pack.
My Dremel charger exploded, small explosion, had no battery in it and only used 5 times, out of warranty can't use intelligent charger, imax B6, like I do with NiMh, due to special shape of battery and don't know what I am doing, so looks like I need to buy another Dremel charger.
Just like a NiMh pack dud Lion cells can be removed and replaced?????
To say I am confused is well..........................
So how is the Lion battery type, more and more power tools are lion powered, better or preferred to say NiMh???
Is Lipo the 'rolled fabric' type that explodes?
Also is a Lion type, a Lipo in a conventional battery case?
We need a thread/discussion just on types of batteries.
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There seems to be an awful lot of fear about lipos. Now from personal experience. I have short cercuited 5 cell lipos together. Accidentally mind. But I plugged them into each other rather than into the y lead I made. Getting all confused. There was a flash of the plugs and they were burned and needed to be replaced. But the batteries themselves were OK. I have also decommissioned lipos with an Axe and believe me the results are very disappointing. What was very exciting was watching a lead acid battery pop. Now that is scary. Lipos can be worked on but be careful. Don't go shorting them deliberately but if ya do likely worse case scenario is a burnt screw driver.
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Good to read about the more serious side of the LiPo batteries. However, I do read it so, that dismantling is possible when being very carefull.
My concern is a little similar, but it's for the LiFePo battery.
What do you think when just a change of leads is needed?
I was looking for some 3cell 9.9V LiFePo as I needed this voltage, but the ones I fund, at a fair price in Europe, was originally sold for TX/RX use, but the ones I found had more ...... discharge (I think it was called so) than normal TX/RX and therefore the seller said that I could just change the leads to take the higher output for a motor.
So how is it done, can I just carefully cut the unit open to get access to the leads inside?